Electrode for flaming-arc lamps.



M. W. 'ALLEN & W. T. 001111.

ELECTRODE FOR FLAMING ARO EAMPS.

APPLICATION FILED APB..23, 1909.

Patented Jan.24, 1911.

unrrnn s'rA'rEs PATENT OFFICE MINER w. ALLEN AND WALLACE-r. coma, orLAKEWOOD, onro, assienons 'ro NA-.

'IIONQAL CARBON COMPANY, OF CLEVELAND, 01-110, A CORPORATION OF NEWJERSEY.

ELECTRODE FOR FLAMING-ARC LAMPS.

Specification of Letters Patent. I Application filed April 23, 1909.Serial No. 491,784.

Patented Jan. 24, 1911.

To all whom it may concern:

Be it known that we, MINER W. ALLEN and WALLACE T. CoNN, both citizensof the United States, and both residing at Lakewood, inthe county ofCuyahoga and State of Ohio, have invented certain new and usefulImprovements'in Electrodes for Flaming-Arc Lamps, of which the followingis a full, clear,and exact description.

This invention relates to electrodes for flaming arc lamps, andparticularly to electrodes which on account of their low conductivity,due largely to the fact that they have rather small cross sectionalareas, are provided each with a metallic Wire extending from end to endto decrease the resistance to the passage of current, such electrodesbeing commonly formed of a carbon shell and a central core, mainly ofpowdered carbon bound together by water glass and some color producingsalt. In an electrode of this 'type,-the wire is extended beyond the endof the same, and generally the end is flattened and bent over along theside of the electrode so that it may be engaged by the clamp which holdsthe electrode, the end of the wire being flattened in order that theclamp may grasp the electrode firmly and so that there will be fairlylarge surfaces of the clamp and flattened wire in contact. Y I

The present invention relates particularl to the connection between theprojecting end of the wire and the electrode proper, and has for itsobject to overcome a number of obj ectionable features of theconstructions heretofore employed.

More partlcularly, the invention aims to attach the end of the wire tothe electrode in a manner such that there will be a better electricalmechanical connection between the wire and the electrode, and to providea connection which prevents the wire from being accidentally withdrawnfrom the electrode; which does away with any liability of the end of thewire being broken and the eiiiciency of the connection both mechanicallyand electrically destroyed, as is the case with prior constructions, andwhich does not prevent any part of the clamp engaging the surface of theelectrode, as is the case when the end of the wire extends along theside of the electrode. 1

In an electrode embodying the present inprojects from the a sideelevation partly sectioned of another embodiment of the invention; andFig. 4 is an end View of the same.

Referring to the parts by letters, A represents the core and B the shellof the electrode; the core A being referably formed of powdered carbonbound together by Water glass and some other color producing salt, andthe shell being formed of carbon as in the electrodes heretoforeconstructed, and C represents a wire passing through a hole, in saidelectrode which extends from end to end, and the upper end of the wireprojects from said hole.

In the construction shown in Figs. 1 and 2 the electrode has"electro-plated upon its end, and, if desired, for a short distance downfrom the end, a coating 1) of copper. The projecting end 0 of the wireis then bent over onto the end of the electrode and against this coppercoating, and is mechanically connected therewith by either beingsoldered thereto or by some equivalent method, as, for example, bydipping the end of the electrode either into a bath of molten tin ormolten zinc, or the like, or by electro-plating.

The construction shown in Fi 3 1s as follows: The core at the upper enof the electrode is removed fora short distance,say one-half inch, moreor less,and then the end of the wire which projects from the u per endof the electrode is bent back upon 1tself, and its end inserted into thehole produced by so removing the core. Then the molten solder E or someother molten metal or alloy is poured into the hole around the wire,which, as in the former case, makes both a mechanical and an electricalconnection between the projecting end of the wire and the electrode. Inneither construction, however, does the wire extend over the end of theelectrode and down against its side,

wherefore said wire does not in any degree interfere with the proper grpping) of the electrode by the clamp. The descri ed connection of thewire-w1th the electrodeat the end thereof does, however, serve to holdthe 7 wire against accidental displacement. With either or any specificembodiment of the invention, it is unnecessary to flatten the wire,

although it may be flattened if desired; and

particularly it is-unnecessary that the flattened wire should be bentdown against the side of the electrode with. danger of breaking it in sodoing, and rendering it exceedelectrode.

in ly likely that in handling the electrode th1s bent flattened end willbe broken off.

It is thought that the best construction is that in which anexternalcoating of metal is applied to the end and a short distance down theside of the electrode, and the projectin end of said wire iselectrically connecte with said coating. With this construction theclamp will grasp the coated end'of the electrode,'and thereby through itsaid clamp will have a good electrical connection with the wire.

Having described our invention, we claim: 1. An electrode forfiamin arclamps having a wire extended throug said electrode from end to end andprojected from the top thereof, said projectin end being connected bothmechanically an electrically to said 2. An electrode for flaming arclamps having a wire extended through said electrode nesses.

from end to end and projected from the top thereof, said projecting endbein bent down against the top. of the electr e and embedded in metalintimately attached. thereto and thereby connected tosaid top bothmechanically and electrically.

3. An electrode for flamin arc lamps having a wire extended througfisaidelectrode from end to end and projected from the top thereof, saidelectrode having a metallic coating applied to its upper end, and theprojecting end of said wire being mechani-' metallic coating.

In testimony whereof, we hereunto'aflix our signatures in the presenceof two wit- MINER W. ALLEN. WALLACE T. CONN.

Witnesses:

0. W. SANFORD GEO. M. SMITH.

